How to stop the "catch all" email received from @myname65.com (I have @myname.com)

Hello,
I think some years back, there was some kind of "catch all" configuration in OVH emails. I can't find it today, so maybe it was removed.
I search on this forum and other pages, I could not find any information. It seems there is no catch-all.

I have a problem with a real estate company who is using myname65.com, very similar to my domain myname(dot)com.
And they do a lot of business. Their clients and suppliers are tending to miss the "65". And all these emails are ending up into my mailbox, because they have frank(at)myname65(dot)com and also paula(at).. .. etc.

I tried few times to reply back, but it did not work.

Is there a way to stop receiving all these wrong emails?

If the email address does not exist, it should bounce back to them with a message, so at least they know they have the wrong one.
At the moment, it seems that paul(at)myname(dot)com is ending in my mailbox and they have no idea of their mistake.

Thanks for your help and suggestions
Thierry

(Sorry for the [at] and [dot]... New user here and cannot put more than 2 links. :smile:)